ANALYSIS OF LITHOMARGE. iCj 



rioife. Thcfc pieces fepanitc again into others 

 Hill fmaller, but the diviilon does not go fo far 

 as to render the particles impalpable, for the/ 

 remain always viiiblc and fcnfiblc to the touch. 



This earth, when pulvcrifcd and boiled in iix- 

 teen times its weight of water, for half an hour, 

 the mixture paries calily through a doubled 

 flicet of filtering paper, almoil perfectly clear, 

 except u fmall degree of whitenefs communi- 

 cated by the fufpended argillaceous particles. 

 This liquor neither reddens paper that is dipped 

 in the tinchirc of turnfolc, or dcftroys the red 

 colour it may have acquired; from which it has 

 neither the property of an acid, or an alkali. 

 The nitrous folutipn of filver poured into it oc- 

 cafions little white clouds, which afterwards, on 

 being cxpofed to the light, turn quite black. 

 The nitrous folution of quickfilver produces al- 

 nioft immediately fmall white particles; and 

 the terra ponderofa, diflblved in muriatic acid, 

 does not aftcci it in any manner. 



On rubbing this earth between the hands in 

 water, it generates no froth like fo;p, but it re- 

 moves impurities, though not fo readily as the o- 

 ihcr kinds. 



Pulverized Lcmnian earth, cxpofed in a glafs 

 veffel to the fire, gradually raifed to a red heat, 

 emits aqueous vapours, and a grateful aromatic 

 odour. Papers, qualified for reagents, cither 

 dyed red with Braiil wood, or blue with thr 

 b 2 turn foil? 



